Port Moresby time zone history
Port Moresby left local mean time (UTC+9:48:40) in 1880, the earliest switch of the 9 zones on UTC+10 standard time with local mean time in the record. On standard time, clocks in Port Moresby run 11 minutes ahead of local mean solar time.
UTC+10
Standard time is UTC+10 all year under the current rules.
UTC+10 every day since 1970
Before 1970
Standard time changes
| Date | Change | New standard time | Clock label |
|---|---|---|---|
| Before 1970 | |||
| January 1, 1880 | Local mean time (UTC+9:48:40) replaced | UTC+9:48:32 | PMMT |
| January 1, 1895 | Standard time forward 11 minutes | UTC+10 | numeric only |
Also on UTC+10
Lindeman (Australia), Brisbane (Australia), Guam, Sydney (Australia), Melbourne (Australia), Hobart (Australia), Macquarie Island (Australia), Vladivostok (Russia) and Ust-Nera (Russia).
Clocks next door since 1970
- Bougainville (995 km): same time except 4,387 days in 2014–2026; 1 hour ahead today.
- Jayapura (Indonesia) (1,054 km): always 1 hour behind.
- Lindeman (Australia) (1,213 km): same time except 756 days in 1971, 1972 and 1989–1994.
- Solomon Islands (1,429 km): always 1 hour ahead.
- Darwin (Australia) (1,813 km): always 30 minutes behind.
How it compares
The Port Moresby zone has kept UTC+10 since 1895, with no clock changes since 1970.